As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT ENROUTE FROM KAPF TO KTEB, CREW WERE ALERTED TO AN AMBER CAS MESSAGE "IRS 1-2 COOL FAIL" CREW DIVERTED TO KRSW AND LANDED WITHOUT FURTHER ISSUE. AIRCRAFT AOG, AND RON. MAINTENANCE TROUBLESHOT THE PROBLEM TO A FAILED IRU. THE FAILED IRU WAS DEFERRED PER MEL AND AIRCRAFT RETURNED TO SERVICE BY AN APPROVED VENDOR.